﻿/*
 *  Copyright Beijing 58 Information Technology Co.,Ltd.
 *
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
//----------------------------------------------------------------------
//<Copyright company="58.com">
//      Team:SPAT
//      Blog:http://blog.58.com/spat/  
//      Website:http://www.58.com
//</Copyright>
//-----------------------------------------------------------------------
public static class StringExtend
{
    public static int GaeaHashCode(this string str)
    {
        unsafe
        {
            fixed (char* src = str)
            {

                int hash1 = 5381;
                int hash2 = hash1;
                int c;
                char* s = src;
                while ((c = s[0]) != 0)
                {
                    hash1 = ((hash1 << 5) + hash1) ^ c;
                    c = s[1];
                    if (c == 0)
                        break;
                    hash2 = ((hash2 << 5) + hash2) ^ c;
                    s += 2;
                }
                return hash1 + (hash2 * 1566083941);
            }
        }
    }
}
